Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
IBM UrbanCode Release - IBM UrbanCode Release is a collaborative release management tool.
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
ConfigCat - ConfigCat is a developer-centric feature flag service with unlimited team size, awesome support, and a reasonable price tag.
Codeship - Codeship is a fast and secure hosted Continuous Delivery platform that scales with your needs.